Sphygmomanometer.



RALPH F. SCHNEIDER, OF NEW YORK, N. Y., ASSIGNOR T CHARLES J. TAGLIABUE,0F

BROOKLYN, NEW YORK.

SPHYGMOIVIANGMETER.

i Specication of Letters Patent.

Patented Dec. 1e, 191e.

To all whom t may concern:

'Be it known that I, RALPH l?. SCHNEIDER, a citizen of the UnitedStates, and a resident or the borough of the Bronx, county of Bronx,city and State of New York,have invented certain new and usefulImprovements in Sphygmomanometers7 of which the following is aspecification.

My invention relates to means for so controlling the gage of asphygmomanometer that any desired actuation of the pointer on 'the dialmay be brought about while the said pointer may also be arrested at anydesired 'ligure or be instantaneously returned to the starting point.

Ieretofore in most instances sphygmomanometers and especially those 03":the mercurial type have been incapable of any accurate controlwhatsoever.

It is the object of this invention to bring about accurate andsubstanti-ally perfect control. Means by which this is accomplishedshown in the drawings in which- Figure 1 illustrates the device as awhole -1 and Fig. 2 an enlarged section through the valve mechanism.

In the eX-ample illustrated 1 is the usual gage constructed in anysuitable manner provided with a dial and a pointer 2. The tube 3communicates at one end with the gage 1 vand at its other end connectswith the valve casing l on one end; the bulb 5 being attached on theother end of the valve casing l. The said tube 3 further, may beconnected by means of a branch tube 3a with the customary pneumaticdevice adapted -for attachment to the arm or other part of the body or"the person under observation in the usual manner.

In using the device illustrated the air passes from the bulb through thepassage 6 around the pin 7 against the washer 8 on the pin seat 9. Thewasher S rest-s against an.

apertured hard rubberv plug 10 and is normally held against the Seatthereof by the spring 11. As the air from the bulb unseats the valve 8,9, it passes through the passage 12 into the chamber 18 and out of said18 is loosely journaled in the micrometer screw 19, the lower face ofwhich is adapted to abut loosely against the head 17 oi' the plunger.After the gage has been inflated a turn on the screw 19 in the properdirection presses the head 17 of the plunger 18 against the valve 20 andopens the valve to permit the escape of a volume' of air correspondingto the amount of rotation given to the micrometer screw. In escaping asdescribed the air passes from the chamber 13 around the open valve 20and leaks between the inner end of the screw 19 and the loosely Fittinghead 17 out through the aperture of lsaid screw 19 in which the stem ofthe plunger 18 loosely lits. This screw 19 can be accurately regulatedVby hand so as to bring about the exact degree ofv deflation andconsequent actuation of the gage that is desired for the purpose ofmaking precise and correct observations. Completel deflation of the gagecan be brought about at any iny stant by pressing the plunger 18. Ifobservations should be taken on the gage at some specific point of thedial, it is only necessary to turn the micrometer screw in the oppositedirection to again reseat the valve 20 as shown in Fig. 2 after whichthe pointer on the dial will be checked at the desired point so thatobservations can be taken there.

It is manifest that numerous variations and modifications of thestructure may be made without departing from the spirit of my invention.

I claim:

. 1. A valve of the kind described comprising a casing having an inletadapted for connection with an inflating means, and an outlet adaptedfor connection with the element to be inflated, said casing beingfurther provided with an escape aperture, means for closing saidaperture, means for actuating said closing means whereby the escape ofair from said casing is accurately controlled in a predetermined mannerand -means for permitting the instantaneous escape of air throughsaidaperture.

2. A valve of the kind described comprising a casing having an inletadapted for connection with an inflating means, and an outlet adaptedfor connection with the element to be inflated, a' rotatable screw.-threaded member having an axial escape aperture, a valve controlling thecommunication between said casing and said axial aperture, and adaptedto be actuated by said rotatable member whereby the escape of air fromsaid casing is accurately controlled in a predetermined manner and aplunger eX- tending through said axial aperture and adapted to actuatesaid valve for permitting the instantaneous escape of air through saidaperture.

3. A valve of the kind described comprising a casing having an inletadapted for connection with an inflating means, and an outlet adaptedfor connection with the element to be inflated, said casing beingfurther provided with an escape aperture, a valve controlling the inletand preventing back passage of the air' therethrough, a screw threadedmember rotatable in said escape aperture and having an aXial aperturecommunicating therewith and with the atmosphere, a plunger extendingthrough said axial aperture and having an enlarged inner end, anoperating head on the outer end of said plunger and a valve arranged tonormally close said escape aperture, said screw thread member beingadapted to bear upon the enlarged inner end of said plunger to cause thesame to actuate said last named valve whereby the escape of air from thecasingvis accurately controlled in a predetermined manner and saidplunger being arranged to independently actuate said last named valvefor permitting the instantaneous escape of air from said casing.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

RALPH F. SCHNEIDER. lVitnesses Fnrrz ZIEGLEB, J r., LOUIS ALEXANDER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

